A supply chain manager has used a forecasting method with 2 different "a" value. How much is the MAD value for each "a"?

Year	Demand	Forecast (a=0.3)	Forecast (a=0.7)
1	10	7	10
2	20	15	14
3	20	16	17

Select one:

a. MAD(a=0.3)= 4, MAD(a=0.7)=5

b. MAD(a=0.3)=4, MAD(a=0.7)=3

c. MAD(a=0.3)= 6, MAD(a=0.7)=3

d. MAD(a=0.3)= 5, MAD(a=0.7)=5